EP0932283B1 - Dispositif de démodulation d'un signal binaire modulé en phase par impulsions codées - Google Patents
Dispositif de démodulation d'un signal binaire modulé en phase par impulsions codées Download PDFInfo
- Publication number
- EP0932283B1 EP0932283B1 EP99400126A EP99400126A EP0932283B1 EP 0932283 B1 EP0932283 B1 EP 0932283B1 EP 99400126 A EP99400126 A EP 99400126A EP 99400126 A EP99400126 A EP 99400126A EP 0932283 B1 EP0932283 B1 EP 0932283B1
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- EP
- European Patent Office
- Prior art keywords
- signal
- phase
- output
- psk
- counter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2335—Demodulator circuits; Receiver circuits using non-coherent demodulation using temporal properties of the received signal
Definitions
- the present invention relates to a device for demodulation of a binary signal modulated in phase by coded pulses.
- phase modulation of a signal by coded pulses is commonly referred to as PSK modulation (for phase shift keying in Anglo-Saxon literature).
- PSK modulation for phase shift keying in Anglo-Saxon literature.
- BPSK modulation BPSK modulation
- the carrier is a high frequency binary signal.
- the modulating signal is a low frequency binary signal, comprising a series of transitions between a high level and a low level representing a coded sequence of "0" and "1".
- the resulting BPSK modulated signal is a binary signal in which each phase change corresponds to a transition from high level to low level, called in the following transition transition or to a transition from low level to high level, called in the transition sequence rising modulating signal.
- FIG. 1 represents an example of a binary signal modulating s m (t) with a non-return to zero type coding, called NRZ coding.
- a bit “1" is coded as a high level over a period tm and a bit "0" is coded as a low level over the period t m .
- the high level and the low level are respectively at + V and -V.
- FIG. 2 represents a modulated signal BPSK resulting s PSK (t), from a carrier of frequency f p .
- the first phase change in the modulated signal corresponds to a first downward transition equivalent to a start bit.
- a device for demodulating a modulated binary signal in phase by coded pulses It's about detecting phase changes in a modulated signal received, to regenerate a demodulated signal at output corresponding to the modulating signal.
- Analog type demodulation devices use mixers that are too bulky and very prone to drifts. These analog devices are also difficult to implement in convenient. We could use a digital device of the exclusive OR type and delay circuits, but of such devices are very dependent on the frequency modulation. They must be adapted for each different modulation frequency.
- EP-A-0 576 826 describes a device for demodulation of a phase modulated binary signal, comprising a phase locked loop.
- a device for BPSK demodulation capable of detecting changes phase on the high frequency modulated signal and which either not very sensitive to drifts (temperature, manufacturing process) and suitable for a wide range of modulation frequency.
- a solution to this technical problem has been found in a loop demodulation device phase lock, including a comparator of phase, a filter and a voltage controlled oscillator.
- said oscillator is such that it outputs a synchronous binary signal of the signal modulated, of frequency equal to N times the frequency carrier, the phase locked loop comprising further a divisor by N of the output of the oscillator to apply it as input to the comparator phase, and the said oscillator output signal being applied as the clock of a first counter for measure the duration of the high levels of the modulated signal and a second counter to measure the duration of low levels of the modulated signal.
- the output of the first counter is used to output a first detection signal of phase change on the high level, when the count reaches a predetermined number.
- the second counter output is used to deliver as output a second change detection signal phase on the low level, when the count reaches a predetermined number.
- phase change detection signals are applied to an RS flip-flop, the output of which provides the demodulated signal.
- the first detection signal will be applied to the input / R to reset the RS flip-flop, while the second detection signal will be applied to the input / S to set this toggle. In the opposite case, it is the second detection signal that will be applied to the reset input and the first signal to the reset input of the RS flip-flop.
- the filter low-pass phase locked loop includes oversized strength and capacity elements.
- FIG. 3 represents a device for BPSK demodulation according to the invention.
- phase locked loop includes a phase comparator CP, followed by a low-pass filter FPB and an oscillator controlled in voltage VCO by the output of the filter.
- the phase locked loop further comprises a divider by N, denoted DIV, between the output of the voltage controlled oscillator and an input e2 of the phase comparator CP.
- the other input e1 of the phase comparator CP receives the modulated signal s PSK (t).
- the frequency of the carrier of the modulated signal s PSK (t) is noted f p .
- the oscillator VCO When the loop of the phase locked loop circuit PLL is hooked, the oscillator VCO according to the invention is such that it outputs a synchronous binary signal s VCO (t), of frequency f 0 equal to N times the carrier frequency f p (N different from 1).
- a synchronous binary signal of frequency equal to the carrier frequency f p of the modulated signal s PSK (t).
- the demodulation device further comprises a first CO 1 counter for measuring the duration of the high levels of the modulated signal.
- the low levels of the signal s PSK (t) reset the counter to zero, while the counting of the pulses of frequency f 0 is done on the high levels.
- the outputs QA, QB, QC, and QD of the counter indicate the number of pulses of frequency f 0 counted for each high level of the modulated signal.
- the demodulation device includes a second CO 2 counter for measuring the duration of the low levels of the modulated signal.
- This counter receives on its reset reset input, the inverse of the modulated signal s PSK (t).
- the signal s PSK (t) is used to reset the counter on each high level, while the counting of the pulses of frequency f 0 is done on the low levels.
- the outputs QA, QB, QC, and QD of the counter indicate the number of pulses of frequency f 0 counted for each low level of the modulated signal.
- the outputs of each counter are applied to a respective decoder, capable of detecting a phase change.
- a phase change on a level results in a duration twice the normal.
- This detector therefore consists of a decoder with a determined number of pulses.
- N 8
- this level with phase change corresponds to eight pulses of frequency f 0 .
- this level suffices to detect that this level lasts for more than 4 signal pulses s VCO (t).
- the detector decodes that 6 pulses have been counted, it generates as output a phase change detection pulse.
- the decoder is a simple NAND gate. The output of this decoder is the phase change detection signal on the corresponding level of the modulated signal s PSK (t).
- the QB, QC outputs of the first counter are thus applied to a first DEC1 detector produced by a NAND gate, to detect a phase change on the high level.
- the change detection signal phase on the high level, at the output of this decoder, is noted D3.
- the outputs QB, Qc of the second counter are applied to a second detector DEC2 produced by a NAND gate, to detect a phase change on the low level of the modulated signal s PSK (t).
- the phase change detection signal on the low level of the modulated signal s PSK (t), at the output of this decoder, is denoted D2.
- Pulse counting and number decoding of pulses can be performed from different manners.
- the counter directly outputs the phase change detection signal, without additional logic. So generally uses the output of each counter, directly or with additional logic, to provide the signal corresponding detection.
- the demodulation device finally comprises a circuit for generating a demodulated signal, denoted D4, from these two phase change detection signals. These signals are used to force at the exit either a passage to the high level or a passage to the low level. If for example, the phase change on the high level of the modulated signal s PSK (t) corresponds to a downward transition of the modulating signal s m (t) and the phase change on the low level of the modulated signal s PSK (t) corresponds to an upward transition of the modulating signal s m (t), the first detection signal D3 will be used to force the setting to "0" and the second detection signal, D2, to force the setting to "1" of the demodulated signal .
- the demodulated signal generation circuit at starting from these signals D2 and D3 is for example a RS flip-flop, whose input / R set to 0 receives the signal D3 and whose 1 / S setting input receives the signal D2.
- the Q output of this RS flip-flop provides the expected demodulated signal, noted D4, as shown in Figure 4. This applies to a detection signal D3 corresponding to a downward transition of the signal modulating, the detection signal D2 then corresponding to an upward transition of the modulating signal. In the otherwise, this is signal D2 that we will apply on the reset input and the D3 signal that will apply on the entry of setting to 1.
- This invention applies to all types of binary coding that can be used for the signal modulating.
- the code used does not affect the demodulation device according to the invention, based on detection of phase changes.
- the demodulation according to the invention works in a very wide modulation frequency range, corresponding to the loop capture range at phase lock.
- the demodulation according to the invention works in a loop capture frequency range at phase lock ranging from 620 KHz to 1.15 MHz.
- the resistance to temperature drifts and method of manufacturing said device because none element of the demodulation device according to the invention is not critical.
- the present invention is particularly suitable data transmission between a card so-called smart card micromodules, of the contactless type and an application system comprising a reader of such a menu.
- an application there is a demodulation device according to the invention in the reading system.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
- les figures 1 et 2 déjà décrites représentent un exemple de signal modulant sm(t) avec un codage de type NRZ et le signal sPSK(t) modulé BPSK correspondant;
- la figure 3 représente un dispositif de démodulation BPSK selon l'invention;
- la figure 4 représente un diagramme temporel d'un exemple de séquence du signal modulant sm(t) et le signal modulé SPSK(t), le signal de sortie de l'oscillateur commandé en tension SVCO(t), les signaux de détection de changement de phase D2, D3 et le signal démodulé D4 correspondants et
- la figure 5 représente un autre diagramme temporel montrant un exemple de séquence pour les signaux de détection D2 et D3 et le signal démodulé D4 correspondant, obtenu en sortie de la bascule RS.
Claims (6)
- Dispositif de démodulation d'un signal binaire de fréquence porteuse fp, modulé en phase (sPSK(t)) par les impulsions codées d'un signal modulant sm(t), comprenant une boucle à verrouillage de phase (PLL) caractérisé en ce que la boucle à verrouillage de phase comprend un comparateur de phase (CP) suivi d'un filtre passe-bas (FPB) et un oscillateur contrôlé en tension (VCO) par la sortie du filtre, l'oscillateur contrôlé en tension délivrant en sortie un signal binaire (sVCO (t)) synchrone du signal modulé (sPSK(t)) et ayant une fréquence (f0), égale à N fois la fréquence porteuse fp, la boucle à verrouillage de phase comprenant en outre un diviseur par N du dit signal de sortie (sVCO(t)) de l'oscillateur, pour appliquer sur une entrée (e2) du comparateur de phase (CP), un signal binaire synchrone du signal modulé et de fréquence, la fréquence porteuse fp, l'autre entrée (e1) du comparateur de phase recevant ledit signal modulé (sPSK(t)), le signal de sortie (sVCO(t)) de l'oscillateur étant appliqué comme horloge (H) d'un premier compteur binaire (CO1) pour mesurer la durée des niveaux hauts du signal modulé (sPSK(t)) et comme horloge d'un deuxième compteur binaire (CO2) pour mesurer la durée des niveaux bas du dit signal modulé, afin de détecter les changements de phase sur ces niveaux.
- Dispositif de démodulation selon la revendication 1, caractérisé en ce que le premier compteur (CO1) et le deuxième compteur (CO2) fourni sont adaptés pour respectivement un premier signal (D3) de détection de changement de phase sur le niveau haut du signal modulé et un deuxième signal (D2) de détection de changement de phase sur le niveau bas du signal modulé lorsque le nombre d'impulsions comptées dans le compteur respectif dépasse un nombre prédéterminé.
- Dispositif de démodulation selon la revendication 2, caractérisé en ce que le dispositif de démodulation comprend une bascule (RS), le premier signal de détection (D3) correspondant à une transition descendante du signal modulant sm(t) étant appliqué sur l'entrée de mise à zéro (/R), le deuxième signal de détection (D2) correspondant à une transition montante du signal modulant étant appliqué sur l'entrée de mise à un (/S), cette bascule donnant en sortie le signal démodulé (D4).
- Dispositif de démodulation selon l'une quelconque des revendications précédentes, caractérisé en ce que N est égal à 8.
- Dispositif de démodulation selon l'une quelconque des revendications précédentes, caractérisé en ce que le filtre passe-bas (FPB), comprend des éléments de capacité et de résistance sur-dimensionnés.
- Application d'un dispositif de démodulation selon l'une quelconque des revendications précédentes, à une carte à micromodule du type sans contact et à un système de lecture correspondant.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9800584 | 1998-01-21 | ||
FR9800584A FR2773933B1 (fr) | 1998-01-21 | 1998-01-21 | Dispositif de demodulation d'un signal binaire module en phase par impulsions codees |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0932283A1 EP0932283A1 (fr) | 1999-07-28 |
EP0932283B1 true EP0932283B1 (fr) | 2001-06-13 |
Family
ID=9521971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99400126A Expired - Lifetime EP0932283B1 (fr) | 1998-01-21 | 1999-01-20 | Dispositif de démodulation d'un signal binaire modulé en phase par impulsions codées |
Country Status (4)
Country | Link |
---|---|
US (1) | US6140869A (fr) |
EP (1) | EP0932283B1 (fr) |
DE (1) | DE69900140T2 (fr) |
FR (1) | FR2773933B1 (fr) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002164811A (ja) | 2000-11-24 | 2002-06-07 | Toshiba Corp | 時期同定方法、時期同定装置および時期同定システム |
JP2009250807A (ja) * | 2008-04-07 | 2009-10-29 | Seiko Epson Corp | 周波数測定装置及び測定方法 |
JP2010271091A (ja) | 2009-05-20 | 2010-12-02 | Seiko Epson Corp | 周波数測定装置 |
JP5440999B2 (ja) | 2009-05-22 | 2014-03-12 | セイコーエプソン株式会社 | 周波数測定装置 |
JP5517033B2 (ja) | 2009-05-22 | 2014-06-11 | セイコーエプソン株式会社 | 周波数測定装置 |
JP5582447B2 (ja) | 2009-08-27 | 2014-09-03 | セイコーエプソン株式会社 | 電気回路、同電気回路を備えたセンサーシステム、及び同電気回路を備えたセンサーデバイス |
JP5815918B2 (ja) | 2009-10-06 | 2015-11-17 | セイコーエプソン株式会社 | 周波数測定方法、周波数測定装置及び周波数測定装置を備えた装置 |
JP5876975B2 (ja) | 2009-10-08 | 2016-03-02 | セイコーエプソン株式会社 | 周波数測定装置及び周波数測定装置における変速分周信号の生成方法 |
RU2451408C2 (ru) * | 2010-01-22 | 2012-05-20 | Федеральное государственное образовательное учреждение высшего профессионального образования Военная академия Ракетных войск стратегического назначения имени Петра Великого МО РФ | Устройство синхронизации несущей и опорной частот в канале связи со значительными частотными нестабильностями и ограничениями на энергетику |
JP5883558B2 (ja) | 2010-08-31 | 2016-03-15 | セイコーエプソン株式会社 | 周波数測定装置及び電子機器 |
RU2454015C1 (ru) * | 2010-10-18 | 2012-06-20 | Открытое акционерное общество "Омский научно-исследовательский институт приборостроения" (ОАО "ОНИИП") | Способ демодуляции частотно-манипулированных абсолютно-биимпульсных сигналов, используемых для передачи информации по коротковолновому каналу связи |
RU2445732C1 (ru) * | 2011-01-11 | 2012-03-20 | Открытое акционерное общество "Концерн "Созвездие" | Способ радиосвязи с множественным доступом |
RU2446560C1 (ru) * | 2011-01-11 | 2012-03-27 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования Сибирский федеральный университет (СФУ) | Устройство ускоренной синхронизации приемника шумоподобных сигналов с минимальной частотной манипуляцией |
RU2625529C2 (ru) * | 2014-09-12 | 2017-07-14 | Открытое акционерное общество "Научно-исследовательский институт автоматизированных систем и комплексов связи "Нептун" | Демодулятор псевдослучайных сигналов с относительной фазовой модуляцией |
US9893916B2 (en) * | 2016-07-01 | 2018-02-13 | Texas Instruments Incorporated | Methods and apparatus for performing a high speed phase demodulation scheme using a low bandwidth phase-lock loop |
RU2752650C1 (ru) * | 2020-12-28 | 2021-07-29 | Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет аэрокосмического приборостроения" | Способ передачи дискретных сигналов на основе частотной модуляции |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2265140A1 (en) * | 1974-03-19 | 1975-10-17 | Labo Cent Telecommunicat | Bit frequency restitution system - detects phase transitions and compares message phase w.r.t. reference |
US3852811A (en) * | 1974-04-10 | 1974-12-03 | Singer Co | Digital data encoding and reconstruction circuit |
EP0576826B1 (fr) * | 1992-05-29 | 2001-02-28 | Sony Corporation | Démodulateur pour signaux modulés en sauts de phase |
FR2738423B1 (fr) * | 1995-08-30 | 1997-09-26 | Snecma | Demodulateur de frequence numerique |
GB2308948B (en) * | 1996-01-06 | 1999-11-24 | Motorola Inc | Data Transfer Circuit and Method |
-
1998
- 1998-01-21 FR FR9800584A patent/FR2773933B1/fr not_active Expired - Fee Related
-
1999
- 1999-01-20 US US09/234,194 patent/US6140869A/en not_active Expired - Lifetime
- 1999-01-20 DE DE69900140T patent/DE69900140T2/de not_active Expired - Lifetime
- 1999-01-20 EP EP99400126A patent/EP0932283B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US6140869A (en) | 2000-10-31 |
FR2773933B1 (fr) | 2000-03-03 |
FR2773933A1 (fr) | 1999-07-23 |
DE69900140D1 (de) | 2001-07-19 |
DE69900140T2 (de) | 2001-09-27 |
EP0932283A1 (fr) | 1999-07-28 |
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